I have had my own gear since my second pool session. NO ONE has ever set it up but me and no one ever will. Once it is set up, I am the only person that moves it if it needs to be moved. I have my equipment the way that I want it for that dive. In Provo, the instructors on the boat (They served as DM's, but I will give credit for certification where it is due. They were a GREAT bunch.) gave us the option up front as to whether or not to set up our gear. No diver from our group wanted them working on our gear. Before I jump into the water, I inflate my b.c. and have the reg in my mouth (sound familar) to insure that the air is on.
I do get help routing hoses in my doubles, but I tell my dive buddy how to route and connect them if need be and look at the connection points myself. Then, I do the same for my dive buddy. We are still in complete control of our own set-ups. In recreational gear, I will dress myself.
As to the tank band, this happened to me in the pool when I got my steel tanks (single 120's) and was weighting myself out with them. This was embarrassing to say the least. But, it WAS in the pool and I learned my lesson about wetting down tank straps the easy way. I will bet that this lady never forgets.